diff --git a/.ipynb_checkpoints/pieces-background-checkpoint.ipynb b/.ipynb_checkpoints/pieces-background-checkpoint.ipynb
deleted file mode 100644
index b48353b..0000000
--- a/.ipynb_checkpoints/pieces-background-checkpoint.ipynb
+++ /dev/null
@@ -1,95 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "code",
-   "execution_count": 22,
-   "id": "7b187c4c-1c53-494d-a30f-fa0431cd4665",
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Done!\n"
-     ]
-    }
-   ],
-   "source": [
-    "# generate random ID for the pieces\n",
-    "from shortuuid import uuid\n",
-    "\n",
-    "# to draw the background\n",
-    "from wand.image import Image\n",
-    "from wand.drawing import Drawing\n",
-    "\n",
-    "# rows and columns for the puzzle\n",
-    "rows = 10\n",
-    "columns = 15\n",
-    "\n",
-    "# resolution for the print\n",
-    "dpi = 300\n",
-    "\n",
-    "# width and height in cm\n",
-    "image_width = 15\n",
-    "image_height = 10\n",
-    "\n",
-    "# name of the puzzle to be more legible?\n",
-    "name = 'katamari'\n",
-    "\n",
-    "\n",
-    "# width and height in pixel\n",
-    "width = int(dpi / 2.54 * image_width)\n",
-    "height = int(dpi / 2.54 * image_height)\n",
-    "\n",
-    "# piece sizes in pixel\n",
-    "piece_width = width / rows\n",
-    "piece_height = height / columns\n",
-    "\n",
-    "\n",
-    "pieces = {}\n",
-    "\n",
-    "with Image(width = width, height = height) as img:\n",
-    "    draw = Drawing()\n",
-    "    draw.font_size = 9\n",
-    "    draw.text_alignment = 'center'\n",
-    "    \n",
-    "    for y in range(columns):\n",
-    "        for x in range(rows):\n",
-    "            \n",
-    "            # generate a random ID for each piece    \n",
-    "            ID = uuid()[:4]\n",
-    "            \n",
-    "            # write the id in the center of each piece\n",
-    "            draw.text(int(x * piece_width + piece_width/2), int(y*piece_height + piece_height/2), f'{name}\\n{ID}')\n",
-    "            \n",
-    "            # store the id and the position in the pieces dictionary\n",
-    "            pieces[ID] = (x,y)\n",
-    "            \n",
-    "    draw(img)\n",
-    "    img.save(filename=f'{name}_retro.png')\n",
-    "    print('Done!')\n"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.7.3"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}